Improvement in wrench



WILLIAM BRADSHAW AND CHARLES LYoaLor DELPHI, iNDIANA.

Letters Patent No. 79,306, dated June 30, 1868,

IMPROVEMENT IN WRENGH.

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T0 ALLWHOM IT MAY GONCERN: n

Be itl-noon that we, WILLIAM BnADsnAiv and 'CHAnLns LYON, of Delphi,`inthe county ef Carroll, and State of Indiana, have invented a new andimproved Wrench; and we do hereby declare that the following is a full,clear, and enact description thereof, whichwill enable others skilled inthe art to make and use-the same, reference being had to theaccompanying drawings, forming part of this specification,

Figure 1 is a side view of'v our improved wrench.

Figure 2 is a modification of the same.

Figure 8 is a detail View of another modification of the spring-jaw.

Similar letters of reference indicate corresponding parts.

The nature of this invention relates to the class of wrenchesgenerallycalled monkey-wrenches, and consists of the devices hereinafter setforth. I

The handle A, shank C, nut D, andjaw B, are of the usual construction.The jaw E, however, instead of encompassing the shank C, and beingthereby held to move along upon it,- is, in our improved Wrench, hingedto the saddle G by the rivet a and arm The base of the jaw E is slotted,to rest upon and on each side of the shank C, and slide along upon itwhen actuated to do so by the nutD, for the said jaw is pressed downupon the shank by a spring, d, having a roller, e, as shown, the saidsp1-ing being aiixed to the saddle G by. a set-screw,f, as shown.

By this device thcjawE is thrown up from the nut H when the -same isbeing unscrewed, by simply turning the wrench on the nut H as a centre,by which operation thejawE is lifted from the shank, as shown at fig.1.v In order that this operation of turning'thewrench ou the nut may berendered possible, the lower part of the movablejawis cut away, as shown`at z', so that the corner of the nut may slip past the lifted jaw, asshown in the sa-Lnc figures. Y

When the wrench is turned in the contrary direction, the jaw, actuatedkby the spring, lmoves back to take arm hold on the nut.

Thus, by moving thc wrench on the nut as a centre, the jaw E is ,thrustout, and the necessity of removing the wrench from the nut at each turnis avoided.

A modification, suitablei'or a pipe-wrench, is shoivn at iig. 2. Itsoperation is obvious, being thel same in principle to that abovedescribed.

Another modification of the jaw E is shown at iig. 3. In thismodiicationthe jawis made slanting instead of being cut away, as shownvat z', in iig. 1, and' the arm b abuts against'a coiled spring, e, in arecess in the saddle, as shown.

i We claim as new, and desire to secure by Letters Patent Theopen-backed jaw E, in combination niith the links 6 and Shanks C,substantially as described for the purpose spccied.

The above specification of' our invention signed by us, this 7th day ofFebruary, 1868.-

WM. BRADSHAW, CHARLES LYON.

Witnesses:

ARTHUR E. PIERCE, GHRIsTIAN Gaos.

